Improvement in alarm-attachments



J.H.THORP.

, Burglar Alarm. I N0.-10'9,971. Patented Dec. 6, 1870 minesses Q w 1 Inventor.

can state JAMES H. THORP, on NEW YORK, NY.

Letters PatentNo. 109,971,- dated December 6, 1870.

\MPROVEMENT IN ALARM-ATTACHMENTS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Be it known that I, James H. 'luonr, of New York City, New York, have invented certain new and, useful Improvements in Alarm-Attachmen ts for Doors and Windows; and do hereby declare that the follow ing is a. full, clear, and exact description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon making a part of this specification.

Fi ure 1 re )resents a view of the door and bolt with.

the alaI'm-attachment.

Figure 2 represents an end view of the alarm. I

l igure 3 represents a view of the bolt with its end over the leverthat causes the alarm.

Figure 4 represents a perspective view of the lever that operates the alarm.

The nature of my invention relates to that class of alarms that is operated by the bolt or lockot' a door, and consists, mainly, in the construction of the keeper which secures the end of-the bolt, and the lever which is hinged on the outer partof the same. A in the drawing represents a door, having on its inside an ordinary sliding bolt of ant-suitable description.

1) represents the door-frame, and to which is attached the bolt-keeper G.

.This keeper or nose is made larger than the door- -bolt, and is provided with a cross-slot, F, as will be hereinafter set forth.

G represents a lever, having three angles, as shown in'fig. 4.

' The lower angle a; of thislever is hinged to the under part of the keeper 0, as shown at a a, fig. 1, thus allowing the angle y to lie in the slot F of-said keeper.

The other angle: extends ashort distance outward, and is connected by a wire,-H, to an alarm. I, of any suitable description, which issecured upon the doorframe or wall of the premises.

- To operate the alarm, the bolt 13 on the door is passed into the keeper 0, under. the angle y ofthe lever G, which lies in the slot F, so that when the 1 door is pushed inward the bolt presses against the angle i ,'carryingdownward the angle 5, and causing the wire H to soundthe alarm I.

\Vhen it is desired to bolt the door so as to not' and the door-bolt 13, all constructed and operating substantially asset forth.

JAMES H. THORP. Witnesses:

W. H. BURRIDGE,

, D. L. HUMPHREY.

are I com. I 

